Effect of duration of restricted-feeding on nutrient excretion, animal performance, and carcass characteristics of Holstein × Zebu finishing steers
F. A. S. Silva A B D , S. C. Valadares Filho A , L. A. Godoi A , B. C. Silva A , M. V. C. Pacheco A , D. Zanetti A , P. D. B. Benedeti B , F. F. Silva A and T. L. Felix C
+ Author Affiliations
- Author Affiliations
A Department of Animal Science, Universidade Federal de Viçosa, 36570-000, Viçosa, Minas Gerais, Brazil.
B Department of Animal Sciences, Universidade do Estado de Santa Catarina, 89815-630, Chapecó, Santa Catarina, Brazil.
C Department of Animal Science, Pennsylvania State University, University Park, PA 16803, USA.
D Corresponding author. Email: fad14@psu.edu; flavia.sales@ufv.br
Animal Production Science 60(4) 535-544 https://doi.org/10.1071/AN18300
Submitted: 11 May 2018 Accepted: 24 April 2019 Published: 31 January 2020
Abstract
Restricted-feeding may be a useful management tool available to reduce environmental impact in feedlots. Therefore, the objectives of the present study were to determine the effects of the duration of restricted-feeding on nitrogen (N) and phosphorus (P) excretion, growth performance and carcass characteristics of finishing steers. Twenty-five Holstein × Zebu steers (average initial bodyweight (BW) = 319 ± 16.2 kg; age = 19 ± 1 months) were used. Five steers were slaughtered to provide baseline empty BW (EBW) and empty body composition at Day 0. The remaining steers were randomly allotted to four groups of five steers, which were restricted to 85% ad libitum feed intake for either 0 (R0), 28 (R28), 42 (R42) or 84 (R84) days of an 84-day finishing period. All steers were fed a diet of 40% corn silage and 60% concentrate (DM basis) for 84 days. Total excretion of faeces and urine were collected during two periods: Days 25 to 27 (period 1) and Days 73 to 75 (period 2). The DM intake, average daily gain (ADG) and gain-to-feed ratio (G : F) were evaluated in three blocks, Days 0 to 28, Days 28 to 42 and Days 42 to 84. As expected, DM, N and P intakes were greater (P < 0.05) for R0 steers than R28, R42 and R84 steers when steers in R28, R42 and R84 treatments were restricted. When transitioned to ad libitum feeding, R28 and R42 steers had similar (P > 0.05) DM, N and P intakes compared with R0 steers. Faecal N and urinary P excretions did not differ (P ≥ 0.40) among restricted and ad libitum-fed steers in either period evaluated. However, greater (P < 0.05) faecal P excretions were observed in steers fed ad libitum intake in period 2 (R0). Phosphorus retention in period 2, and whole-body N retention were greatest (P < 0.05) in steers fed R28 and least (P < 0.05) in steers fed R84, steers fed R0 and steers fed R42 were intermediate and not different (P > 0.05). Final BW, overall ADG, G : F and carcass characteristics were not affected (P ≥ 0.11) by treatments. Restricted-feeding Holstein × Zebu steers to 85% of ad libitum intake for 84 days in the feedlot reduced DM intake and P excretion, without impairing steer growth performance or carcass characteristics. Nevertheless, it is important to highlight that the small sample size was one limitation of this present experiment.
Additional keywords: beef cattle, feed conversion efficiency, management, nitrogen, phosphorus.
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